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Long-Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Total debt    
Long-term debt $ 36,078us-gaap_LongTermDebt $ 36,078us-gaap_LongTermDebt
Amounts payable within one year 0us-gaap_LongTermDebtCurrent 0us-gaap_LongTermDebtCurrent
Long-term debt, noncurrent 36,078us-gaap_LongTermDebtNoncurrent 36,078us-gaap_LongTermDebtNoncurrent
Term loan [Member]    
Total debt    
Long-term debt 30,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sga_TermLoanMember
30,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= sga_TermLoanMember
Revolving credit facility [Member]    
Total debt    
Long-term debt 5,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
5,000us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember
Secured debt of affiliate [Member]    
Total debt    
Long-term debt $ 1,078us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
$ 1,078us-gaap_LongTermDebt
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember